After upgrade from RHEL 8.1 to 8.4, the fibre Channel devices are no longer discovered
Issue
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After upgrading the system from RHEL 8.1 kernel-4.18.0-147.85 to 8.4 kernel-4.18.0-305.91.1.el8_4 or later, the fibre channel devices are no longer discovered.
Booting with problematic kernel shows frequent Link Down/Up events on console:
ibmvfc 30000011: Host partition: VIOS2, device: vfchost1 U11 ibmvfc 30000011: Link Down event received. scsi_id: 0, wwpn: 0, node_name: 0 ibmvfc 30000011: Link Up event received. scsi_id: 0, wwpn: 0, node_name: 0 [...] ibmvfc 30000011: Link Down event received. scsi_id: 0, wwpn: 0, node_name: 0 ibmvfc 30000011: Link Up event received. scsi_id: 0, wwpn: 0, node_name: 0 [...]
Environment
- Red Hat Enterprise Linux 8.6, 8.4
- kernel version >
4.18.0-305.91.1.el8_4 - VM/Logical partition (LPAR) in IBM PowerVM
- IBM Virtual FC adapters
- Direct-attached FC storage for VIOS NPIV clients
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